TY - JOUR AU - Reizer, Edina AU - Tokaji, György Marcell AU - Palusiak, Marcin AU - Viskolcz, Béla AU - Fiser, Béla TI - The first step of polycyclic aromatic hydrocarbon growth – A case study of hydrogen abstractions by •H, •OH, and •CH3 radical JF - COMPUTATIONAL AND THEORETICAL CHEMISTRY J2 - COMPUT THEOR CHEM VL - 1234 PY - 2024 PG - 7 SN - 2210-271X DO - 10.1016/j.comptc.2024.114530 UR - https://m2.mtmt.hu/api/publication/34717280 ID - 34717280 LA - English DB - MTMT ER - TY - JOUR AU - Hatvani-Nagy, Alpár Ferencz AU - Hajdu, Viktória AU - Ilosvai, Mária Ágnes AU - Muránszky, Gábor AU - Sikora, Emőke AU - Kristály, Ferenc AU - Daróczi, Lajos AU - Viskolcz, Béla AU - Fiser, Béla AU - Vanyorek, László TI - Bentonite as eco-friendly natural mineral support for Pd/CoFe2O4 catalyst applied in toluene diamine synthesis JF - SCIENTIFIC REPORTS J2 - SCI REP VL - 14 PY - 2024 IS - 1 PG - 9 SN - 2045-2322 DO - 10.1038/s41598-024-54792-5 UR - https://m2.mtmt.hu/api/publication/34656926 ID - 34656926 AB - Toluene diamine (TDA) is a major raw material in the polyurethane industry and thus, its production is highly important. TDA is obtained through the catalytic hydrogenation of 2,4-dinitrotoluene (2,4-DNT). In this study a special hydrogenation catalyst has been developed by decomposition cobalt ferrite nanoparticles onto a natural clay-oxide nanocomposite (bentonite) surface using a microwave-assisted solvothermal method. The catalyst particles were examined by TEM and X-ray diffraction. The palladium immobilized on the bentonite crystal surface was identified using an XRD and HRTEM device. The obtained catalyst possesses the advantageous property of being easily separable due to its magnetizability on a natural mineral support largely available and obtained through low carbon- and energy footprint methods. The catalyst demonstrated outstanding performance with a 2,4-DNT conversion rate exceeding 99% along with high yields and selectivity towards 2,4-TDA and all of this achieved within a short reaction time. Furthermore, the developed catalyst exhibited excellent stability, attributed to the strong interaction between the catalytically active metal and its support. Even after four cycles of reuse, the catalytic activity remained unaffected and the Pd content of the catalyst did not change, which indicates that the palladium component remained firmly attached to the magnetic support's surface. LA - English DB - MTMT ER - TY - JOUR AU - Talei, Saeed AU - Fozer, D. AU - Varbanov, P.S. AU - Szanyi, Ágnes AU - Mizsey, Péter TI - Oxyfuel Combustion Makes Carbon Capture More Efficient JF - ACS OMEGA J2 - ACS OMEGA VL - 9 PY - 2024 IS - 3 SP - 3250 EP - 3261 PG - 12 SN - 2470-1343 DO - 10.1021/acsomega.3c05034 UR - https://m2.mtmt.hu/api/publication/34533660 ID - 34533660 N1 - Export Date: 26 January 2024 Correspondence Address: Szanyi, A.; Institute of Chemistry, Hungary; email: szanyi.agnes@vbk.bme.hu Funding details: European Commission, EC, CZ.02.1.01/0.0/0.0/15 003/0000456 Funding details: Hungarian Scientific Research Fund, OTKA, 128543 Funding text 1: The authors appreciate the financial support of the Stipendium Hungaricum program, the Hungarian Scientific Research Funds OTKA 128543, and the LIFE19 CCA/HU/001320–LIFE-CLIMCOOP project supported by EU LIFE program. The EU project Sustainable Process Integration Laboratory─SPIL, funded as project no. CZ.02.1.01/0.0/0.0/15 003/0000456, by Czech Republic Operational Programme Research and Development, Education is also gratefully acknowledged. The precious contribution of Prof. Dr. Jiri Klemes is highly acknowledged and appreciated. AB - Fossil energy carriers cannot be totally replaced, especially if nuclear power stations are stopped and renewable energy is not available. To fulfill emission regulations, however, points such as emission sources should be addressed. Besides desulfurization, carbon capture and utilization have become increasingly important engineering activities. Oxyfuel technologies offer new options to reduce greenhouse gas emissions; however, the use of clean oxygen instead of air can be dangerous in the case of certain existing technologies. To replace the inert effect of nitrogen, carbon dioxide is mixed with oxygen gas in the case of such air combustion processes. In this work, the features of carbon capture in five different flue gases of air combustion and such oxyfuel combustion where additional carbon dioxide is mixed with clean oxygen are studied and compared. The five different flue gases originate from the gas-fired power plant, coal-fired power plant, coal-fired combined heat and power plant, the aluminum production industry, and the cement manufacturing industry. Monoethanolamine, which is an industrially preferred solvent for carbon dioxide capture from gas streams at low pressures, is selected as an absorbent, and the same amount of carbon dioxide is captured; that is, always that amount of carbon dioxide is captured, which is the result of the fossil combustion process. ASPEN Plus is used for mathematical modeling. The results show that the oxyfuel combustion cases need significantly less energy, especially at high carbon dioxide removal rates, e.g., higher than 90%, than that of the air combustion cases. The savings can even be as high as 84%. Moreover, 100% carbon capture was also be completed. This finding can be due to the fact that in the oxyfuel combustion cases, the carbon dioxide concentration is much higher than that of the air combustion cases because of the inert carbon dioxide and that higher carbon dioxide concentration results in a higher driving force for the mass transfer. The oxyfuel combustion processes also show another advantage over the air combustion processes since no nitrogen oxides are produced in the combustion process. © 2024 The Authors. Published by American Chemical Society. LA - English DB - MTMT ER - TY - CHAP AU - Horváth, Tamás AU - Jordán, Anikó AU - Kecskés, Karina AU - Dorogházi, Emma AU - Viskolcz, Béla AU - Szőri, Milán ED - Mentes, Dóra ED - Hornyák-Mester, Enikő ED - Fiser, Béla ED - Viskolcz, Béla ED - Varga, Miklós ED - Farkas, László ED - Jordán, Anikó TI - Energetic Perspectives of Urethane Linkage Termination for Sustainable Polyurethane Development T2 - Symposium on Polyurethane Innovation 2023 - Conference Booklet PB - Miskolci Egyetem, Felsőoktatási és Ipari Együttműködési Központ CY - Miskolc-Egyetemváros SN - 9789633583081 PY - 2023 SP - 13 UR - https://m2.mtmt.hu/api/publication/34443629 ID - 34443629 LA - English DB - MTMT ER - TY - CHAP AU - Gráczer, Kitti AU - Viskolcz, Béla AU - Bánhidi, Olivér ED - Mentes, Dóra ED - Hornyák-Mester, Enikő ED - Fiser, Béla ED - Viskolcz, Béla ED - Varga, Miklós ED - Farkas, László ED - Jordán, Anikó TI - Alkálifémek (Li, Na, K, Cs) Mátrix-Elemenként Kis Koncentrációjú (0 – 1 mg/l) Stroncium Emittált Intenzitására Kifejtett Hatásának Vizsgálata Induktív Csatolt Plazma Spektrometriás Gerjesztés Esetén T2 - Symposium on Polyurethane Innovation 2023 - Conference Booklet PB - Miskolci Egyetem, Felsőoktatási és Ipari Együttműködési Központ CY - Miskolc-Egyetemváros SN - 9789633583081 PY - 2023 SP - 178 UR - https://m2.mtmt.hu/api/publication/34442850 ID - 34442850 LA - Hungarian DB - MTMT ER - TY - CHAP AU - Tokaji, György Marcell AU - Péter, Tóth AU - Fiser, Béla AU - Boros, Renáta Zsanett ED - Mentes, Dóra ED - Hornyák-Mester, Enikő ED - Fiser, Béla ED - Viskolcz, Béla ED - Varga, Miklós ED - Farkas, László ED - Jordán, Anikó TI - Polyurethane Degradation Methods – A Literature Review T2 - Symposium on Polyurethane Innovation 2023 - Conference Booklet PB - Miskolci Egyetem, Felsőoktatási és Ipari Együttműködési Központ CY - Miskolc-Egyetemváros SN - 9789633583081 PY - 2023 SP - 85 UR - https://m2.mtmt.hu/api/publication/34442826 ID - 34442826 LA - English DB - MTMT ER - TY - JOUR AU - Hajdu, Viktória AU - Vanyorek, László TI - Mágneses katalizátor alkalmazása 2,4-dinitrotoluol katalitikus hidrogénezésében JF - Doktorandusz Almanach J2 - Doktorandusz Almanach VL - 2023 PY - 2023 IS - 1 SP - 98 EP - 103 PG - 6 SN - 2939-7294 UR - https://m2.mtmt.hu/api/publication/34416295 ID - 34416295 LA - Hungarian DB - MTMT ER - TY - JOUR AU - Talei, Saeed AU - Hadjadj, Rachid AU - Mizsey, Péter AU - Owen, Michael Christopher TI - Analysis of Molecular Dynamics Simulation of Carbonic Anhydrase JF - HUNGARIAN MATERIALS AND CHEMICAL SCIENCES AND ENGINEERING J2 - HUNG MATER CHEM SCI ENG VL - 47 PY - 2023 IS - 1 SP - 109 EP - 117 PG - 9 SN - 3004-0000 DO - 10.32974/mse.2022.011 UR - https://m2.mtmt.hu/api/publication/34406416 ID - 34406416 LA - English DB - MTMT ER - TY - JOUR AU - Hajdu, Viktória AU - Prekob, Ádám AU - Muránszky, Gábor AU - Kristály, Ferenc AU - Daróczi, Lajos AU - Harasztosi, Lajos AU - Kaleta, Zoltán AU - Viskolcz, Béla AU - Nagy, Miklós AU - Vanyorek, László TI - Amine Functionalization Leads to Enhanced Performance for Nickel- and Cobalt-Ferrite-Supported Palladium Catalysts in Nitrobenzene Hydrogenation JF - INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES J2 - INT J MOL SCI VL - 24 PY - 2023 IS - 17 PG - 14 SN - 1661-6596 DO - 10.3390/ijms241713347 UR - https://m2.mtmt.hu/api/publication/34117847 ID - 34117847 AB - Easy preparation, good yield and easy recovery are the key challenges in the development of industrial catalysts. To meet all these three criteria, we have prepared intelligent, magnetizable NiFe2O4- and CoFe2O4-supported palladium catalysts that can be easily and completely recovered from the reaction medium by magnetic separation. The fast and facile preparation was achieved by a solvothermal method followed by sonochemical-assisted decomposition of the palladium nanoparticles onto the surface of the magnetic nanoparticles. The metal–support interaction was enhanced by amine functionalization of the supports using monoethanolamine. The performance and stability of the non-functionalized and amine-functionalized NiFe2O4- and CoFe2O4-supported palladium catalysts were compared in the industrially important nitrobenzene hydrogenation reaction. All catalysts showed high catalytic activity during aniline synthesis; complete nitrobenzene conversion and high aniline yield (above 97 n/n%) and selectivity (above 98 n/n%) were achieved. However, during reuse tests, the activity of the non-functionalized catalysts decreased, as the palladium was leached from the surface of the support. On the other hand, in the case of their amine-functionalized counterparts, there was no decrease in activity, and a non-significant decrease in palladium content could be measured. Based on these results, it can be concluded that amine functionalization of transition metal ferrites may result in more effective catalysts due to the enhanced metal–carrier interaction between the support and the precious metal. LA - English DB - MTMT ER - TY - JOUR AU - Prekob, Ádám AU - Hajdu, Viktória AU - Fejes, Zsolt AU - Kristály, Ferenc AU - Viskolcz, Béla AU - Vanyorek, László TI - Preparation and Testing of a Palladium-Decorated Nitrogen-Doped Carbon Foam Catalyst for the Hydrogenation of Benzophenone JF - INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES J2 - INT J MOL SCI VL - 24 PY - 2023 IS - 15 PG - 11 SN - 1661-6596 DO - 10.3390/ijms241512211 UR - https://m2.mtmt.hu/api/publication/34104723 ID - 34104723 AB - Catalytic activity of a palladium catalyst with a porous carbon support was prepared and tested for benzophenone hydrogenation. The selectivity and yields toward the two possible reaction products (benzhydrol and diphenylmethane) can be directed by the applied solvent. It was found that in isopropanol, the prepared support was selective towards diphenylmethane with high conversion (99% selectivity and 99% benzophenone conversion on 323 K after 240 min). This selectivity might be explained by the presence of the incorporated structural nitrogens in the support. LA - English DB - MTMT ER -